1) use a fill flash and a flash extender it the distance is more then 8 meters or so

2) if the subject is standing/sitting still try using a focus point which has average light for the image you are taking and which is roughly the same istance as the main subjuct... this can be hard to accomplish but it does help if you have the time.

3) switch away from single point or center focus... this is hit and miss at best when talking about wildlife photography

4) Post processing will help balance out a lot.

your shutter speeds are also very slow for wildlife photography... especially action shots. Try upping your ISO and dont be afraid to go to 1600 or more if needed on cloudy days.

lastly learn an animals threat zone and try to position yourself or make your approach in/from a direction where the light is most favorable. This is tough when shooting wildlife but should always be one of your first considerations whenever possible.

good to know the tricks i reduced shutter speed because the image bird in 1 and 3 was not moving around. also i tried increasing the shutter speed but it was not giving birds proper feather colour with a bright background. But i not tried to increase ISO (Infact i forget about it).

use a bigger iso to get the faster shutter speed, wide aperture to blur the background (also allows faster shutter) use spot metering so the bird is exposed properly, matrix metering will try to get the whole scene in focus but if you have a really bright background it can mess up,

also shoot in raw so you can do a lot of editing later if needed

for panning shots, low shutter speed and use continuous shooting so you at least get one shot in focus